Hi YanXi,
On 10/17/2011 05:25 AM, YangXi wrote:
I'm asking a question about how to wrapping a refcounted class inside perl.
I have some experience on embedding perl in C++, but have little
knowledge on perl XS, and I found perldoc perlxs really puzzled.
Firstly, I have an simple refcounted C++ base class like this:
I'm sorry that this isn't a solution for your problem, but maybe it's
helpful nonetheless. Object ownership and refcounts are something
extremely nasty to deal with when interfacing between two languages that
have a very different view of it. For this reason, it's easiest not to
have C++ do the refcounting at all. I understand that this might not be
possible in your case.
If you just have a regular, non-refcounting object in C++, you can
easily use typemaps like O_OBJECT from
http://cpansearch.perl.org/src/MBARBON/ExtUtils-XSpp-0.1602/examples/Object-WithIntAndString/perlobject.map
to have the object wrapped into a Perl scalar. The C++ object will be
owned by that scalar and the refcount will be perl's refcount of the
SV*. In that case a simple DESTROY XS method will suffice along the
lines of the DESTROY here:
http://cpansearch.perl.org/src/SMUELLER/Math-SimpleHisto-XS-1.23/XS.xs
The macro in that case can often be replaced by "delete self" for C++
objects.
I hope this has some general pointers that help a bit.
Best regards,
Steffen
